Explanation:
Hardening is the process of securing a system by reducing its surface of vulnerability. Reducing the surface of vulnerability typically includes removing unnecessary functions and
features, removing unnecessary usernames or logins and disabling unnecessary services.

Incorrect Answers:
A: Error handling is an aspect of secure coding. When errors occur, the system should revert back to a secure state. This must be coded into the system, and should include error and
exception handling.
C: Patch management is the process of maintaining the latest source code for applications and operating systems. This helps protect a systems from newly discovered attacks and
vulnerabilities.
D: Cross-site scripting (XSS) is a form of malicious code-injection attack on a web server in which an attacker injects code into the content sent to website visitors. XSS can be
mitigated by implementing patch management on the web server, using firewalls, and auditing for suspicious activity.